Time Warner Cable says in an investigating a blackout on its standard-definition Fox channel in Southern California that cut off the Super Bowl for its customers.

The company said in a Twitter message that it's working to resolve the problem, which is not affecting the Fox high-definition channel.

Hundreds of football fans are taking to Twitter to complain about the blackout, which occurred shortly before the halftime show. Two other Time Warner cable channels — KCAL-TV and KTLA-TV — were also blacked out.

It wasn't immediately clear how many customers were affected by the blackout.

Calls and email messages to Time Warner Cable spokesmen were not immediately returned, though the cable provider has been tweeting updates: